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Business Combination Transactions (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 18, 2018
Jun. 30, 2018
Jan. 29, 2018
Island Offshore Subsea AS      
Business Acquisition      
Business Acquisition, Percentage of Voting Interests Acquired     51.00%
Cash consideration $ 42.4    
Goodwill, acquired $ 85.0    
Series of individually immaterial business acquisitions      
Business Acquisition      
Consideration transferred   $ 61.0